610 
BIBLIOGRAPHY. 
the influence of the air are the most strongly silicified. Prom an 
experiment upon Maize, the author finds silica to bear a very 
different relation to the nutritive processes of a siliceous plant 
than do phosphorus, sulphur, alkalies or lime. He found this 
plant to attain its usual height, and bear several large leaves and 
a spike with seeds capable of germination, with only *7 per cent, 
of silicic acid in the ash; this was taken up from the glass vessel in 
which the plant was grown. Maize-straw grown with free access 
to silica, contains 18-23 per cent, in its ash. 
Sachs, J.—Uebersicht der Ergebnisse der neueren Untersuchungen 
uber das Chlorophyll. Ibid. pp. 129,177. This review of the recent 
literature of Chlorophyll is drawn up with a view to sift the 
satisfactorily established data from those which are incomplete 
and uncertain. The chapters are, 1. The structure of Chloro¬ 
phyll. 2. Its origin. 3. Its granular contents. 4. The green 
colouring matter of chlorophyll. 5. Its optical peculiarities. 
6. Influence of light on the origin and alteration of chlorophyll. 
-Mikrochemische Untersuchungen. Ibid. p. 289. 
Sadler, J. and W. Bell. —Note in reference to the Bursting of the 
Spathe of Seaforthia elegans. Trans. Bot. Soc. Ed. p. 268. 
Sagot, P.—Principes generaux de Geographie Agricole. Bev. 
Monde Col. 1862. 
•-Explication Physiologique de la mauvaise vegetation des 
legumes des pays temperes sous Tequateur. Bull. Soc. Bot. ix. 
p. 147. M. Sagot finds that while the abundant light, medium 
humidity and moderately active vegetation of the temperate zone 
are coupled with vegetable products rich in albuminous matter ; 
in the tropics great heat, abundant moisture and luxuriant vege¬ 
tation afford products relatively poor in albumen. The results of 
his enquiry into the causes to which the difference is due are here 
detailed. 
Sass, A. v.—Die Phanerogamen Elora Oesells und der benachbarten 
Eilande. Arch. Nat. Kurlands, etc. Bd. ii. p. 575. 
- Beitrag zur Elora der Insel Bunoe. Ibid. p. 647. 
Schacht, H.—Ueber der Stamm und die Wurzel der Araucaria 
Brasiliensis. Bot. Zeit. 1862. p. 409. With 2 plates. A minute 
account of the anatomy of the wood of the root and trunk, with 
reference to criticisms of Yon Mohl. 
Schaeeeer, G. C.—On a remarkable form of rotation in the pith-cells 
of Saururus cernuus. Am. Journ. xxxiv. p. 400. The author finds 
in the smaller cells forming the middle of the partitions separating 
the air-canals of the pith, a motion of granules (of unknown com¬ 
position), closely resembling that well-known in the terminal 
vesicles of Closterium. This, however, we have always regarded 
as something very different from the so-called ‘ swarming ’ of 
Gonidia in the freshwater Algae with which Dr. Schaeffer seems 
to confound it. He regards the phenomenon in Saururus as in 
connection with active vitality and capacity for division. 
